Thread: Bigger Tires = New Tunes?
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Old Sat, June 25th, 2011, 07:54 PM
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Originally Posted by KIRT View Post
I also recently added larger tires(today)...265/70R-17 Nitto Terra Grapplers along with new pro comp wheels. I reset the tire size to 2521 after following the recommended formula per my instruction manual. There was a vague reference to possible gear ratio changes due to larger tire size in my manual. Should I be adjusting this value?
No Kirt -

You make sure the Gryphon is using the actual Gear Ratio (GR) that is INSTALLED in your truck.

I'm not sure what "reference" you are talking about though. It COULD be that installing larger tires reduces the "effective Gear Ratio" on your truck, which it does. Or, that to regain the "stock GR feel, power, etc." after installing larger tires you would have to install higher gears, which is also true.

- Jack